<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form>
    籍贯<select>
        <!-- 默认选中状态 -->
        <option>江苏</option>
        <option>山东</option>
        <option selected="selected">外星人</option>
    </select>
</form>
</body>
</html>